<template>
    <div>
        <el-card>
            <el-tag
                    :key="tag"
                    v-for="tag in dynamicTags"
                    closable
                    :disable-transitions="false"
                    @close="handleClose(tag)">
                {{tag}}
            </el-tag>
            <el-input
                    class="input-new-tag"
                    v-if="inputVisible"
                    v-model="inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm"
                    @blur="handleInputConfirm"
            >
            </el-input>
            <el-button v-else class="button-new-tag" size="small" @click="showInput">+ New Tag</el-button>
        </el-card>
    </div>
</template>

<script>
    export default {
        name: "label",
        data() {
            return {
                dynamicTags: ['标签一', '标签二', '标签三'],
                inputVisible: false,
                inputValue: ''
            };
        },
        methods: {
            handleClose(tag) {
                this.dynamicTags.splice(this.dynamicTags.indexOf(tag), 1);
            },

            showInput() {
                this.inputVisible = true;
                this.$nextTick(() => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },

            handleInputConfirm() {
                let inputValue = this.inputValue;
                if (inputValue) {
                    this.dynamicTags.push(inputValue);
                }
                this.inputVisible = false;
                this.inputValue = '';
            }
        }
    }
</script>

<style scoped>
    .el-tag + .el-tag {
        margin-left: 10px;
    }
    .button-new-tag {
        margin-left: 10px;
        height: 32px;
        line-height: 30px;
        padding-top: 0;
        padding-bottom: 0;
    }
    .input-new-tag {
        width: 90px;
        margin-left: 10px;
        vertical-align: bottom;
    }
</style>